摘要
为探究氢气介入对氨燃料的自着火特性及化学动力学的影响,本文开展了氨/氢气组合燃料着火延迟期的实验、模拟和理论研究。通过激波管实验装置测量了化学计量比氨/氢气组合燃料在1 MPa,温度1124~1695 K,掺氢比0%,5%,30%和70%时的着火延迟期。结合实验数据,评估了现有氨动力学模型对着火延迟期的预测表现,利用Otomo模型分析了氨/氢气着火的化学动力学交互影响。研究发现,氨着火延迟随氢气掺混比增加呈现非线性缩短,低掺氢比时氢气对着火的促进效果更加显著;5%掺氢可导致对纯氨高温着火抑制作用最强反应NH_(3)+H■NH_(2)+H_(2)化学平衡逆向移动;继续增大掺氢比,氨燃料相关化学反应对着火的抑制作用增强,削弱了氢气对着火的促进作用。
To understand the influence of hydrogen addition on the auto-ignition characteristics of ammonia fuel, the experimental, simulation and theoretical studies on the ignition delay times of ammonia/hydrogen mixtures were carried out. The ignition delay times of stoichiometric ammonia/hydrogen mixtures were measured in a shock tube at 1 MPa, 1124~1695 K, and 0%, 5%, 30% and 70% hydrogen blending ratio. Based on the experimental data, the prediction performances of existing ammonia kinetic models on ignition delay times were evaluated, the chemical kinetic interaction of ammonia/hydrogen ignition was analyzed by using the Otomo model. It is found that the ignition delay of ammonia decreases nonlinearly with the increase of hydrogen blending ratio;the chemical equilibrium of NH_(3)+H■NH_(2)+H_(2)can be reversed by 5% hydrogen doping;with the increase of hydrogen mixing ratio, the inhibition effect of ammonia-related reaction on ignition is enhanced, and the promotion effect of hydrogen addition on the ignition delay time is weakened.
作者
陈俊蝶
姜雪
张瑞
秦晓康
黄佐华
CHEN Jundie;JIANG Xue;ZHANG Rui;QIN Xiaokang;HUANG Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an710049,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2023年第1期250-256,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51876164)
中国博士后基金(No.2018M640987,No.2019T120907)
江苏省航空动力系统重点实验室开放课题(No.CEPE2020009)。
关键词
氨
氢气
着火延迟期
化学动力学
ammonia
hydrogen
ignition delay
chemical kinetics
